We have performed the first measurement of the coherent ψ(2S)photo-production cross section in ultra-peripheral Pb–Pb collisions at the LHC. This charmonium excited state is reconstructed via the ψ(2S) →l+l−and ψ(2S) →J/ψπ+π−decays, where the J/ψdecays into two leptons. The analysis is based on an event sample corresponding to an integrated luminosity of about 22μb−1. The cross section for coherent ψ(2S)production in the rapidity interval −0.9 <y <0.9 is dσcohψ(2S)/dy =0.83 ±0.19stat+systmb. The ψ(2S)to J/ψcoherent cross section ratio is 0.34+0.08−0.07(stat+syst). The obtained results are compared to predictions from theoretical models.

Adam, J., Adamová, D., Aggarwal, M.M., Aglieri Rinella, G., Agnello, M., Agrawal, N., et al. (2015). Coherent ψ(2S) photo-production in ultra-peripheral PbPb collisions at sqrt(s_NN)=2.76 TeV. PHYSICS LETTERS. SECTION B, 751, 358-370 [10.1016/j.physletb.2015.10.040].

Coherent ψ(2S) photo-production in ultra-peripheral PbPb collisions at sqrt(s_NN)=2.76 TeV

ALICI, ANDREA;ARCELLI, SILVIA;BASILE, MAURIZIO;BELLINI, FRANCESCA;CIFARELLI, LUISA;COLOCCI, MANUEL;GUERZONI, BARBARA;SCIOLI, GILDA;
2015

Abstract

We have performed the first measurement of the coherent ψ(2S)photo-production cross section in ultra-peripheral Pb–Pb collisions at the LHC. This charmonium excited state is reconstructed via the ψ(2S) →l+l−and ψ(2S) →J/ψπ+π−decays, where the J/ψdecays into two leptons. The analysis is based on an event sample corresponding to an integrated luminosity of about 22μb−1. The cross section for coherent ψ(2S)production in the rapidity interval −0.9
2015
Adam, J., Adamová, D., Aggarwal, M.M., Aglieri Rinella, G., Agnello, M., Agrawal, N., et al. (2015). Coherent ψ(2S) photo-production in ultra-peripheral PbPb collisions at sqrt(s_NN)=2.76 TeV. PHYSICS LETTERS. SECTION B, 751, 358-370 [10.1016/j.physletb.2015.10.040].
Adam, J.; Adamová, D.; Aggarwal, M.M.; Aglieri Rinella, G.; Agnello, M.; Agrawal, N.; Ahammed, Z.; Ahn, S.U.; Aimo, I.; Aiola, S.; Ajaz, M.; Akindinov...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/540790
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